Electrical apparatus casing



April 21, 1925.

M. o. TROY ELECTRI CAL APPARATUS GAS ING Filed May 27, 1922 .llllmlll Inventor":

His Attorney.

I Patented Apr. 21,- 1325.

' UNITED STATES )PAT 1,534,749 ENT' OFFICE.

IATTHEW O. TB -OI-OF PITTSFIELD, I ASBACHUSEETB, ASSIGN'QB TO GENERAL ELEC TRIO COMPANY, A COBPOBATIOK OI 203K.

APPARATUS CASING.

Application am m a, 1922. semi Io. scam.

To all whom it may concern: a

Be it known that I, MAI'IHEW O. TROY, a citizen of the United States, residin at Pittsfield, in the county oi Berkshire tate of Massachusetts, have invented certain new and useful Improvements in Electrical Ap-i paratus Casings, of which the following is a specification.

My invention relates toelectrical induction apparatus which is cooled by a suitable liquid, such as oil, in which the apparatus -is immersed .withm a surrounding casing.

When a transformer'or other electrical induction apparatus is immersed in oil within a casing, the heat generated by the apparatus and transferred to the oil causes the oil to expand and contract. It is desirable that the compartment containin the electrical apparatus be completely fil ed with oil in order to exclude all air, the heated oil in contact with the apparatus thus being protected from oxidation and absorption of moisture. The expansion and contraction of the oil is commonly provided for by connecting to the apparatus compartment .a separate expansion compartment or chamber which is partiall filled withoil. The general object of tlie present invention is to provide a simple and inexpensive electrical apparatus caslng with an apparatus compartment and a separate expansion'compartment arranged to prevent any 'oxidation products or moisture formed'in the expansion chamber from passing back into the apparatus compartment. A further object of the invention is to construct the casing in.

such manner that'it may be easily opened for inspection or repair of the apparatus therein.

Other objects and-advantages will appear from the following description taken in connection with the accompanying drawing which shows one form of the invention and in which Fig 1 is a view, partly in section, of a casing constructed in accordance with the invention and containing" an oil immersed transformer, Fig. 2 is a detailed sectional view of a modification of the invention, and Fig. 3 is another detailed sectional view of a further modification.

Like reference characters refervto similar parts in the difi'erent figures of the drawing.

In the particular embodiment of the invention shown in the drawing, the casing includes a base 1, wall 2 and cover 3. The

p ragm or partition}. The lower compartment contains the electrical apparatus, shown as a transformer 5, from which suit .able leads extend through an insulating section 6 of the diaphragm 5 to bushings or outlets 7 in the cover 3 of the casing. The section 6 of the diaphragm may support separable connections interposed in the leads if desired as shown in. Fig. 3. Communication between the two compartments is provided by an opening in the diaphragm, the opening being formed either in the insulating section 6 of the diaphragm as shown in Figs. 1 and 3 or in some other portion thereof If desired as shown in Fig. 2. A sufficient quantity of insulating oil is supplied to fill completely the apparatus compartment and to extend up through the o ening in the diaphragm and partially fill t e upper compartment. The upper compartment serves as an expansion chamber, the oil flowing to and fro between the compartments as the portion of oil within the apparatus compartment expands and contracts.

The cover 3 of the casing may be made gas tight if desired, in which case the space above the oil i'n the upper or expansion chamber may be filled with a cushion of air or some inert gas sufiiciently compressible to permit the expansion and contraction of the oil. If the cover is not gas tight, then air from outside'the casing will be drawn into the expansion compartment each time that the oil contracts. In either case, the

oil is subject to more or less contamination where itcomes in contact with the gas and particularly when the gas used is air. The opening extending through the diaphragm between the apparatus and expansion compartments is arranged with its upper end so high that any moisture or other substance which may collect and settle in the expansion compartment will remain above the diaphragm and cannot pass down into the oil in the apparatus compartment to impair its insulating strength. In 'ac-, cordance with the invention, the diaphragm is formed with a low or depressed portion where moisture or other matter whlch se tles through the oil may collect and whence it may be drawn oil through a faucet 8. As shown in the drawing, an upwardly convex diaphragm is used, the outer edge portion being therefore lower than other parts.

. Another feature of the inventioneresides in the manner in which the diaphragm is securedin place. A small shoulder or shelf 9 on the inner surface of the .wall 2fof the casing has a shallow groove to receive the outer ed e of the dia hragmnwl ich is sealed i to t e groove with suitable sealing compo d 10 to make the joint substantially tight and to hold the diaphragm in place.

The seal mayv bebroken or weakened to facilitate removal of the diaphragm by ull.-.

ing out a wire or its equivalent whic is embedded in the compound 10. t This invention provides'a simple and efiicient casin for 011 immersed e ectrical agparatus an one well adapted to protect t e apparatus and theoil surrounding. it from in ury or deterioration.

What I claim as new and desire to secure ing the ower compartment an extending through said opening to a level in the upper compartment above the upper end of the by Letters Patent of the United States, is

1. An electrical apparatus casing having an upper compartment and a lower compartment separated b a partition, the partition having an ins ating portion with an opening to provide commumcation between said com artments, an insulating liquid fillopening, electrical apparatus immersed in the liquid in the lower compartment, and

leads extending from said apparatus through the insulating ortion of the par: t ition to outlets above t e partition, 'asecond portionof the partition being below the upper end of the opening in its insulating ortion to collect substances settlingin the quid above the partition and prevent their passage through said opening into the lower compartment.

2. An electrical apparatus casing having an upper compartment and a. lowercompartment separated by a partition having an insulating portion, there being an opening connectmg said two compartments, an

insulating liquid filling thelower compartment an partially filling the upper com- In witness whereof, I have hereunto set 00 my hand.

- MATTHEW O. TROY. 

